Bug: ob-R.el breaks when :session is specified

Bug: ob-R.el breaks when :session is specified

[Christian Heinrich]

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Hi there,

I got back to an org file after upgrading to the latest release of org-mode and tried executing the
contained R source blocks. Unfortunately, emacs got stuck in the execution and was blocked; I had to
exit using C-g.

Here's a minimal example src block that causes emacs to get stuck:

#+begin_src R :results output :session *R* :exports both
  a <- 10
  a
#+end_src

R itself does start and the code is also executed correctly. However, the output from that session
is apparently not returned to emacs or the buffer.

When removing the :session argument it executes and returns as expected.

When bisecting this issue, I found that this commit causes it:
ac8c009e006197d2dad226dbe822d450aec23d23

    lisp/ob-R.el: Fix session output with substrings matching prompts

Reverting it fixes the issue for earlier release (9.5.3) as well as for the current main branch.

The (with-current-buffer session ... ) somehow seems to break it for me, but I am unsure why no one
else here seems to experience this as the commit is from 2020?

Any suggestions?

Thanks!
Christian

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Re: Bug: ob-R.el breaks when :session is specified

[Ihor Radchenko]

Christian Heinrich <com-orgmode-mailinglist@gladbachcity.de> writes:

> I got back to an org file after upgrading to the latest release of org-mode and tried executing the
> contained R source blocks. Unfortunately, emacs got stuck in the execution and was blocked; I had to
> exit using C-g.
>
> Here's a minimal example src block that causes emacs to get stuck:
>
> #+begin_src R :results output :session *R* :exports both
>   a <- 10
>   a
> #+end_src
>
> R itself does start and the code is also executed correctly. However, the output from that session
> is apparently not returned to emacs or the buffer.

I tried you example using Emacs >=26 and it works just fine.

Best,
Ihor

Re: Bug: ob-R.el breaks when :session is specified

[Christian Heinrich]

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Hi,

thanks, that's what I had expected since that patch has been around for a long time.

I run 

 emacs -q --load /tmp/init.el --file=/tmp/test.org 

with my /tmp/init.el being only

> (require 'package)
> (package-initialize)
> (add-to-list 'load-path "~/.emacs.d/straight/repos/org/lisp/")
> (require 'org)
> 
> ;(require 'ess-site)
> (org-babel-do-load-languages
>    'org-babel-load-languages
>     '((R . t)))

I hope this constitutes a minimal example for a config - please correct me if I'm wrong.

My test.org contains the source block I had already posted:

#+begin_src R :results output :session *R* :exports both
  a <- 10
  a
#+end_src

Any ideas how I could continue to debug this? If I just remove that patch, everything works
flawlessly for me but I would like to figure out what causes the issues.

Thanks!

Christian


On Sun, 2022-05-15 at 16:08 +0800, Ihor Radchenko wrote:
> Christian Heinrich <com-orgmode-mailinglist@gladbachcity.de> writes:
> 
> > I got back to an org file after upgrading to the latest release of org-mode and tried executing
> > the
> > contained R source blocks. Unfortunately, emacs got stuck in the execution and was blocked; I
> > had to
> > exit using C-g.
> > 
> > Here's a minimal example src block that causes emacs to get stuck:
> > 
> > #+begin_src R :results output :session *R* :exports both
> >   a <- 10
> >   a
> > #+end_src
> > 
> > R itself does start and the code is also executed correctly. However, the output from that
> > session
> > is apparently not returned to emacs or the buffer.
> 
> I tried you example using Emacs >=26 and it works just fine.
> 
> Best,
> Ihor

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Re: Bug: ob-R.el breaks when :session is specified

[Jeremie Juste]

Hello Christian,

Thanks for reporting but I cannot reproduce the bug with the org and
emacs version below.

Org mode version 9.5.3 (release_9.5.3-467-g2bd34e @
/home/djj/src/org-mode/lisp/)
GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.24) of
2022-01-16

Can you please let me know which version of org-mode you are actually
using?

Ihor, many thanks for checking.

Best regards,
Jeremie

On Sunday, 15 May 2022 at 16:08, Ihor Radchenko wrote:
> Christian Heinrich <com-orgmode-mailinglist@gladbachcity.de> writes:
>
>> I got back to an org file after upgrading to the latest release of org-mode and tried executing the
>> contained R source blocks. Unfortunately, emacs got stuck in the execution and was blocked; I had to
>> exit using C-g.
>>
>> Here's a minimal example src block that causes emacs to get stuck:
>>
>> #+begin_src R :results output :session *R* :exports both
>>   a <- 10
>>   a
>> #+end_src
>>
>> R itself does start and the code is also executed correctly. However, the output from that session
>> is apparently not returned to emacs or the buffer.
>
> I tried you example using Emacs >=26 and it works just fine.
>
> Best,
> Ihor

Re: Bug: ob-R.el breaks when :session is specified

[Christian Heinrich]

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Hi Jeremie,

I just tested with

 Org mode version 9.5.3 (release_9.5.3-504-gcdbb1c @
/home/heinrich/.emacs.d/straight/repos/org/lisp/)

using

GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0) of 2021-
11-27, modified by Debian

I am on Debian Testing and that is the default emacs version.

Using the unmodified org (git hash from above) I get the following messages when executing a src
block with R:

   executing R code block...
   Loading ‘ess-bugs-l’: unescaped character literals `?(', `?)' detected, `?\(', `?\)' expected!
   Type C-h m for help on ESS version 15.09
   ess-tracebug mode enabled
   Quit
   Package cl is deprecated
   
Note that the "Quit" is me pressing Ctrl-g after a few seconds.

Removing the commit in question makes the block return instantaneously:

   executing R code block...
   Loading ‘ess-bugs-l’: unescaped character literals `?(', `?)' detected, `?\(', `?\)' expected!
   Type C-h m for help on ESS version 15.09
   ess-tracebug mode enabled
   Code block evaluation complete.
   Package cl is deprecated
   
I anticipated that this would not be obvious, since this feature is used too much to go unnoticed for
two years - but I am clueless as to how I should continue with debugging...

Thanks for your help!
Christian

On Sun, 2022-05-15 at 16:16 +0200, Jeremie Juste wrote:
> 
> Hello Christian,
> 
> Thanks for reporting but I cannot reproduce the bug with the org and
> emacs version below.
> 
> Org mode version 9.5.3 (release_9.5.3-467-g2bd34e @
> /home/djj/src/org-mode/lisp/)
> GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.24) of
> 2022-01-16
> 
> Can you please let me know which version of org-mode you are actually
> using?
> 
> Ihor, many thanks for checking.
> 
> Best regards,
> Jeremie
> 
> On Sunday, 15 May 2022 at 16:08, Ihor Radchenko wrote:
> > Christian Heinrich <com-orgmode-mailinglist@gladbachcity.de> writes:
> > 
> > > I got back to an org file after upgrading to the latest release of org-mode and tried
> > > executing the
> > > contained R source blocks. Unfortunately, emacs got stuck in the execution and was blocked; I
> > > had to
> > > exit using C-g.
> > > 
> > > Here's a minimal example src block that causes emacs to get stuck:
> > > 
> > > #+begin_src R :results output :session *R* :exports both
> > >   a <- 10
> > >   a
> > > #+end_src
> > > 
> > > R itself does start and the code is also executed correctly. However, the output from that
> > > session
> > > is apparently not returned to emacs or the buffer.
> > 
> > I tried you example using Emacs >=26 and it works just fine.
> > 
> > Best,
> > Ihor

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Re: Bug: ob-R.el breaks when :session is specified

[Berry, Charles]

Um...

> On May 15, 2022, at 2:46 AM, Christian Heinrich <com-orgmode-mailinglist@gladbachcity.de> wrote:
> 
> I run 
> 
> emacs -q --load /tmp/init.el --file=/tmp/test.org 
> 
> with my /tmp/init.el being only
> 
>> (require 'package)
>> (package-initialize)
>> (add-to-list 'load-path "~/.emacs.d/straight/repos/org/lisp/")
>> (require 'org)
>> 
>> ;(require 'ess-site)

The line above is commented out. So how do you load ess-site?


>> (org-babel-do-load-languages
>>   'org-babel-load-languages
>>    '((R . t)))
> 
> I hope this constitutes a minimal example for a config - please correct me if I'm wrong.


Just spitballing here:

Have you tried instrumenting `org-babel-R-evaluate-session'? 

Maybe watching changes made to the session buffer on first evaluation and comparing to subsequent evals helps.

HTH,
Chuck

Re: Bug: ob-R.el breaks when :session is specified

[Jeremie Juste]

Hello Christian

On Sunday, 15 May 2022 at 20:06, Christian Heinrich wrote:
> I just tested with
>
>  Org mode version 9.5.3 (release_9.5.3-504-gcdbb1c @
> /home/heinrich/.emacs.d/straight/repos/org/lisp/)
>
> using
>
> GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0) of 2021-
> 11-27, modified by Debian


Many thanks for reporting back.  I updated to gcdbb1c and it is still working fine.

My minimum working example is the following. From the org-mode root directory,

$ emacs -Q -L ./lisp -l org  -l ~/ess-barebone.el

where ~/ess-barebone.el is the following:

#+begin_src  elisp
(add-to-list 'load-path "/home/djj/.emacs.d/elpa/ess-20220125.2207/")
(require 'ess-r-mode)

 (org-babel-do-load-languages
   'org-babel-load-languages
   '((R . t)))

(setq org-confirm-babel-evaluate nil)
#+end_src

Note that I'm still using a rather old ess version. Could you please try
with the above configuration? Note that I am using a rather old ess
version but the I haven't experienced issues with the newer one.

Best regards
Jeremie


> Hi Jeremie,
>
> I just tested with
>
>  Org mode version 9.5.3 (release_9.5.3-504-gcdbb1c @
> /home/heinrich/.emacs.d/straight/repos/org/lisp/)
>
> using
>
> GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0) of 2021-
> 11-27, modified by Debian
>
> I am on Debian Testing and that is the default emacs version.
>
> Using the unmodified org (git hash from above) I get the following messages when executing a src
> block with R:
>
>    executing R code block...
>    Loading ‘ess-bugs-l’: unescaped character literals `?(', `?)' detected, `?\(', `?\)' expected!
>    Type C-h m for help on ESS version 15.09
>    ess-tracebug mode enabled
>    Quit
>    Package cl is deprecated
>
> Note that the "Quit" is me pressing Ctrl-g after a few seconds.
>
> Removing the commit in question makes the block return instantaneously:
>
>    executing R code block...
>    Loading ‘ess-bugs-l’: unescaped character literals `?(', `?)' detected, `?\(', `?\)' expected!
>    Type C-h m for help on ESS version 15.09
>    ess-tracebug mode enabled
>    Code block evaluation complete.
>    Package cl is deprecated
>
> I anticipated that this would not be obvious, since this feature is used too much to go unnoticed for
> two years - but I am clueless as to how I should continue with debugging...
>
> Thanks for your help!
> Christian
>
> On Sun, 2022-05-15 at 16:16 +0200, Jeremie Juste wrote:
>> 
>> Hello Christian,
>> 
>> Thanks for reporting but I cannot reproduce the bug with the org and
>> emacs version below.
>> 
>> Org mode version 9.5.3 (release_9.5.3-467-g2bd34e @
>> /home/djj/src/org-mode/lisp/)
>> GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.24) of
>> 2022-01-16
>> 
>> Can you please let me know which version of org-mode you are actually
>> using?
>> 
>> Ihor, many thanks for checking.
>> 
>> Best regards,
>> Jeremie
>> 
>> On Sunday, 15 May 2022 at 16:08, Ihor Radchenko wrote:
>> > Christian Heinrich <com-orgmode-mailinglist@gladbachcity.de> writes:
>> > 
>> > > I got back to an org file after upgrading to the latest release of org-mode and tried
>> > > executing the
>> > > contained R source blocks. Unfortunately, emacs got stuck in the execution and was blocked; I
>> > > had to
>> > > exit using C-g.
>> > > 
>> > > Here's a minimal example src block that causes emacs to get stuck:
>> > > 
>> > > #+begin_src R :results output :session *R* :exports both
>> > >   a <- 10
>> > >   a
>> > > #+end_src
>> > > 
>> > > R itself does start and the code is also executed correctly. However, the output from that
>> > > session
>> > > is apparently not returned to emacs or the buffer.
>> > 
>> > I tried you example using Emacs >=26 and it works just fine.
>> > 
>> > Best,
>> > Ihor

Re: Bug: ob-R.el breaks when :session is specified

[Christian Heinrich]

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Hi Jeremie,

thank you for providing this example!

The ess that was found in the load path was years old and once updated, all issues were resolved. In
fact, my so-called minimum init still used (require 'package) and I didn't even think about ESS
causing this trouble.

It's now a bit clearer how to build a real minimum init - thank you!

This is hence resolved.

Best regards
Christian

On Mon, 2022-05-16 at 00:21 +0200, Jeremie Juste wrote:
> 
> Hello Christian
> 
> On Sunday, 15 May 2022 at 20:06, Christian Heinrich wrote:
> > I just tested with
> > 
> >  Org mode version 9.5.3 (release_9.5.3-504-gcdbb1c @
> > /home/heinrich/.emacs.d/straight/repos/org/lisp/)
> > 
> > using
> > 
> > GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0) of
> > 2021-
> > 11-27, modified by Debian
> 
> 
> Many thanks for reporting back.  I updated to gcdbb1c and it is still working fine.
> 
> My minimum working example is the following. From the org-mode root directory,
> 
> $ emacs -Q -L ./lisp -l org  -l ~/ess-barebone.el
> 
> where ~/ess-barebone.el is the following:
> 
> #+begin_src  elisp
> (add-to-list 'load-path "/home/djj/.emacs.d/elpa/ess-20220125.2207/")
> (require 'ess-r-mode)
> 
>  (org-babel-do-load-languages
>    'org-babel-load-languages
>    '((R . t)))
> 
> (setq org-confirm-babel-evaluate nil)
> #+end_src
> 
> Note that I'm still using a rather old ess version. Could you please try
> with the above configuration? Note that I am using a rather old ess
> version but the I haven't experienced issues with the newer one.
> 
> Best regards
> Jeremie
> 
> 
> > Hi Jeremie,
> > 
> > I just tested with
> > 
> >  Org mode version 9.5.3 (release_9.5.3-504-gcdbb1c @
> > /home/heinrich/.emacs.d/straight/repos/org/lisp/)
> > 
> > using
> > 
> > GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0) of
> > 2021-
> > 11-27, modified by Debian
> > 
> > I am on Debian Testing and that is the default emacs version.
> > 
> > Using the unmodified org (git hash from above) I get the following messages when executing a src
> > block with R:
> > 
> >    executing R code block...
> >    Loading ‘ess-bugs-l’: unescaped character literals `?(', `?)' detected, `?\(', `?\)'
> > expected!
> >    Type C-h m for help on ESS version 15.09
> >    ess-tracebug mode enabled
> >    Quit
> >    Package cl is deprecated
> > 
> > Note that the "Quit" is me pressing Ctrl-g after a few seconds.
> > 
> > Removing the commit in question makes the block return instantaneously:
> > 
> >    executing R code block...
> >    Loading ‘ess-bugs-l’: unescaped character literals `?(', `?)' detected, `?\(', `?\)'
> > expected!
> >    Type C-h m for help on ESS version 15.09
> >    ess-tracebug mode enabled
> >    Code block evaluation complete.
> >    Package cl is deprecated
> > 
> > I anticipated that this would not be obvious, since this feature is used too much to go
> > unnoticed for
> > two years - but I am clueless as to how I should continue with debugging...
> > 
> > Thanks for your help!
> > Christian
> > 
> > On Sun, 2022-05-15 at 16:16 +0200, Jeremie Juste wrote:
> > > 
> > > Hello Christian,
> > > 
> > > Thanks for reporting but I cannot reproduce the bug with the org and
> > > emacs version below.
> > > 
> > > Org mode version 9.5.3 (release_9.5.3-467-g2bd34e @
> > > /home/djj/src/org-mode/lisp/)
> > > GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.24) of
> > > 2022-01-16
> > > 
> > > Can you please let me know which version of org-mode you are actually
> > > using?
> > > 
> > > Ihor, many thanks for checking.
> > > 
> > > Best regards,
> > > Jeremie
> > > 
> > > On Sunday, 15 May 2022 at 16:08, Ihor Radchenko wrote:
> > > > Christian Heinrich <com-orgmode-mailinglist@gladbachcity.de> writes:
> > > > 
> > > > > I got back to an org file after upgrading to the latest release of org-mode and tried
> > > > > executing the
> > > > > contained R source blocks. Unfortunately, emacs got stuck in the execution and was
> > > > > blocked; I
> > > > > had to
> > > > > exit using C-g.
> > > > > 
> > > > > Here's a minimal example src block that causes emacs to get stuck:
> > > > > 
> > > > > #+begin_src R :results output :session *R* :exports both
> > > > >   a <- 10
> > > > >   a
> > > > > #+end_src
> > > > > 
> > > > > R itself does start and the code is also executed correctly. However, the output from that
> > > > > session
> > > > > is apparently not returned to emacs or the buffer.
> > > > 
> > > > I tried you example using Emacs >=26 and it works just fine.
> > > > 
> > > > Best,
> > > > Ihor
> 

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Re: Bug: ob-R.el breaks when :session is specified

[Christian Heinrich]

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Hi Jeremie,

thank you for providing this example!

The ess that was found in the load path was years old and once updated, all issues were resolved. In
fact, my so-called minimum init still used (require 'package) and I didn't even think about ESS
causing this trouble.

It's now a bit clearer how to build a real minimum init - thank you!

This is hence resolved.

Best regards
Christian


On Mon, 2022-05-16 at 00:21 +0200, Jeremie Juste wrote:
> 
> Hello Christian
> 
> On Sunday, 15 May 2022 at 20:06, Christian Heinrich wrote:
> > I just tested with
> > 
> >  Org mode version 9.5.3 (release_9.5.3-504-gcdbb1c @
> > /home/heinrich/.emacs.d/straight/repos/org/lisp/)
> > 
> > using
> > 
> > GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0) of
> > 2021-
> > 11-27, modified by Debian
> 
> 
> Many thanks for reporting back.  I updated to gcdbb1c and it is still working fine.
> 
> My minimum working example is the following. From the org-mode root directory,
> 
> $ emacs -Q -L ./lisp -l org  -l ~/ess-barebone.el
> 
> where ~/ess-barebone.el is the following:
> 
> #+begin_src  elisp
> (add-to-list 'load-path "/home/djj/.emacs.d/elpa/ess-20220125.2207/")
> (require 'ess-r-mode)
> 
>  (org-babel-do-load-languages
>    'org-babel-load-languages
>    '((R . t)))
> 
> (setq org-confirm-babel-evaluate nil)
> #+end_src
> 
> Note that I'm still using a rather old ess version. Could you please try
> with the above configuration? Note that I am using a rather old ess
> version but the I haven't experienced issues with the newer one.
> 
> Best regards
> Jeremie
> 
> 
> > Hi Jeremie,
> > 
> > I just tested with
> > 
> >  Org mode version 9.5.3 (release_9.5.3-504-gcdbb1c @
> > /home/heinrich/.emacs.d/straight/repos/org/lisp/)
> > 
> > using
> > 
> > GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0) of
> > 2021-
> > 11-27, modified by Debian
> > 
> > I am on Debian Testing and that is the default emacs version.
> > 
> > Using the unmodified org (git hash from above) I get the following messages when executing a src
> > block with R:
> > 
> >    executing R code block...
> >    Loading ‘ess-bugs-l’: unescaped character literals `?(', `?)' detected, `?\(', `?\)'
> > expected!
> >    Type C-h m for help on ESS version 15.09
> >    ess-tracebug mode enabled
> >    Quit
> >    Package cl is deprecated
> > 
> > Note that the "Quit" is me pressing Ctrl-g after a few seconds.
> > 
> > Removing the commit in question makes the block return instantaneously:
> > 
> >    executing R code block...
> >    Loading ‘ess-bugs-l’: unescaped character literals `?(', `?)' detected, `?\(', `?\)'
> > expected!
> >    Type C-h m for help on ESS version 15.09
> >    ess-tracebug mode enabled
> >    Code block evaluation complete.
> >    Package cl is deprecated
> > 
> > I anticipated that this would not be obvious, since this feature is used too much to go
> > unnoticed for
> > two years - but I am clueless as to how I should continue with debugging...
> > 
> > Thanks for your help!
> > Christian
> > 
> > On Sun, 2022-05-15 at 16:16 +0200, Jeremie Juste wrote:
> > > 
> > > Hello Christian,
> > > 
> > > Thanks for reporting but I cannot reproduce the bug with the org and
> > > emacs version below.
> > > 
> > > Org mode version 9.5.3 (release_9.5.3-467-g2bd34e @
> > > /home/djj/src/org-mode/lisp/)
> > > GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.24) of
> > > 2022-01-16
> > > 
> > > Can you please let me know which version of org-mode you are actually
> > > using?
> > > 
> > > Ihor, many thanks for checking.
> > > 
> > > Best regards,
> > > Jeremie
> > > 
> > > On Sunday, 15 May 2022 at 16:08, Ihor Radchenko wrote:
> > > > Christian Heinrich <com-orgmode-mailinglist@gladbachcity.de> writes:
> > > > 
> > > > > I got back to an org file after upgrading to the latest release of org-mode and tried
> > > > > executing the
> > > > > contained R source blocks. Unfortunately, emacs got stuck in the execution and was
> > > > > blocked; I
> > > > > had to
> > > > > exit using C-g.
> > > > > 
> > > > > Here's a minimal example src block that causes emacs to get stuck:
> > > > > 
> > > > > #+begin_src R :results output :session *R* :exports both
> > > > >   a <- 10
> > > > >   a
> > > > > #+end_src
> > > > > 
> > > > > R itself does start and the code is also executed correctly. However, the output from that
> > > > > session
> > > > > is apparently not returned to emacs or the buffer.
> > > > 
> > > > I tried you example using Emacs >=26 and it works just fine.
> > > > 
> > > > Best,
> > > > Ihor
> 

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Re: Bug: ob-R.el breaks when :session is specified

[Christian Heinrich]

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Hi Charles,

ob-R.el requires ess and the (require 'package) makes sure the ~/.emacs.d/elpa/ directory was added
to the load path. But you were somewhat right already: the loaded ESS was years old and caused the
issue.

Thanks for your help!

Christian

On Sun, 2022-05-15 at 19:58 +0000, Berry, Charles wrote:
> 
> Um...
> 
> > On May 15, 2022, at 2:46 AM, Christian Heinrich <com-orgmode-mailinglist@gladbachcity.de> wrote:
> > 
> > I run 
> > 
> > emacs -q --load /tmp/init.el --file=/tmp/test.org 
> > 
> > with my /tmp/init.el being only
> > 
> > > (require 'package)
> > > (package-initialize)
> > > (add-to-list 'load-path "~/.emacs.d/straight/repos/org/lisp/")
> > > (require 'org)
> > > 
> > > ;(require 'ess-site)
> 
> The line above is commented out. So how do you load ess-site?
> 
> 
> > > (org-babel-do-load-languages
> > >   'org-babel-load-languages
> > >    '((R . t)))
> > 
> > I hope this constitutes a minimal example for a config - please correct me if I'm wrong.
> 
> 
> Just spitballing here:
> 
> Have you tried instrumenting `org-babel-R-evaluate-session'? 
> 
> Maybe watching changes made to the session buffer on first evaluation and comparing to subsequent
> evals helps.
> 
> HTH,
> Chuck
> 

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